Ignition control device and method for flame ionization detector

Abstract

The invention provides an ignition control device and method for a flame ionization detector. The ignition control device comprises a detector fixing base, a shell, a polarization electrode, a collector, an ignition head, a polarization electrode control circuit and an igniter high-voltage control circuit, wherein the polarization electrode, the collector and the ignition head are arranged in the shell, the polarization electrode and the collector are arranged on the same axis, a spare space exists between the polarization electrode and the collector, the detector fixing base is arranged at the lower end of the shell, the polarization electrode is arranged on the detector fixing base, an outlet is formed in the upper portion of the shell, the polarization electrode control circuit is connected with the polarization electrode and provides high voltage for the same, and the igniter high-voltage control circuit is connected with the ignition head and provides high voltage for the same.

Description

technical field [0001] The invention relates to an ignition control device and a control method for a hydrogen flame ionization detector. Background technique [0002] Hydrogen flame ionization detector is a general-purpose gas chromatographic instrument. Because of its high sensitivity, wide linear range, and response to most organic compounds, it is often used for the detection of organic pollutant samples. The detector uses the flame generated by the combustion of hydrogen and air as the energy source. When the organic compound enters the flame of hydrogen and oxygen combustion, chemical ionization occurs at high temperature, and the ionization produces ions that are several orders of magnitude higher than the base flow. Under the action, an ion current is formed, and a weak ion current (10 -12 ~10 -8 A) After high-resistance amplification, it becomes an electrical signal proportional to the amount of organic compounds entering the flame, and the organic compounds are q...

AI Technical Summary

Problems solved by technology

[0010] (1) Ignition with direct igniter: use stainless steel, platinum wire and other materials as the igniter to ignite, but stainless steel will age and be easy to burn out in a high-temperature and high-humidity environment for a long time; platinum wire improves the oxidation resistance of the igniter. However, platinum wire is a precious metal, the cost is high, and platinum wire is soft, so it is difficult to install and maintain

[0011] (2) split-type igniter: the igniter is placed on the front portion of the detector as a separate module, and the water vapor generated by combustion is discharged from the middle of the two connectors; The air mixing area is far away, the ignition time is long, and ignition is difficult; and the split detector cannot be used in analysis conditions that require high temperature heat tracing, such as pollution sources

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